| William Gourlay Blair | |
| Constituency Mp: | Lanark |
| Parliament: | Canadian |
| Predecessor: | Bert H. Soper |
| Successor: | George Doucett |
| Term Start: | 1945 |
| Term End: | 1957 |
| Birth Date: | 13 January 1890 |
| Birth Place: | Bathurst Township, Ontario, Canada |
| Nationality: | British subject |
| Party: | Progressive Conservative Party |
| Occupation: | physician |
William Gourley Blair (January 13, 1890 in Bathurst Township, Ontario - June 16, 1957) was a politician and physician.
He was elected to the House of Commons of Canada in the 1945 election as a Member of the Progressive Conservative Party to represent the riding of Lanark. He was re-elected in 1949, 1953 and in 1957. He was appointed to the joint committees of Joint Committee on Federal District Commission and Joint Committee on Old Age Security. Prior to his federal political experience, he was a captain in the Royal Canadian Army Medical Corps between 1916 and 1919.